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A gas turbine with a "Heat Recovery Steam Generator" (HRSG) is a system that generates energy in two ways.

  1. The gas turbine drives a mechanical load, such as a generator
  2. The hot exhaust gases from the turbine are used to produce steam, which in turn drives a steam turbine coupled in to a generator or other mechanical load

The HRSG is basically a large steam boiler where the hot exhaust gases from a gas turbine are used to produce the steam. The HRSG may also be equipped with a set of burners (also known as "duct burners") to provide additional heating of the exhaust gases, or in other words, generate additional heat for steam production. Depending on the design of the HRSG, the burners may also be used to generate the necessary heat for steam production when the gas turbine is out of service. Since the gas turbine exhaust normally contains sufficient oxygen (12-16%) for proper fuel combustion at the burners, additional combustion air (such as ambient air) is only needed when the gas turbine is not in operation. The Burner Management System monitors all functions and as such should be continuously aware of the state of the gas turbine and of the boiler. The interaction between the BMS and the gas turbine also ensures that the purge sequences are performed properly.

In terms of sequences, an HRSG is clearly more complicated than a conventional burner. In addition to the functions for a conventional burner, the BMS for a HRSG must also provide for the purge of the burner, of the gas turbine and of the HRSG in combination. The air dampers (including bypass damper, inlet damper and ambient air "ambient air" damper) must all be operated but also the positive must be monitored. The gas turbine must be informed that conditions are safe to start and the gas turbine must inform the BMS when it is operating at "cranking speed" (i.e. purging), when it is in normal operation, whether it has successfully ignited, and so on. However, when the gas turbine unexpectedly goes offline or when one of the vaporizers leaves its position, the BMS must quickly switch and put the vaporizers in the correct position in order to continue operation as much as possible and to limit possible production loss. Of course in a safe way.

We have designed the Burner Management System to include all of the above requirements, and more, as standard. For example, we offer a complete and intuitive user interface through our graphical HMI (Human-Machine Interface). We offer unambiguous and complete status and alarm management including "first-up" alarms (first-up: showing the first occurring alarm). Furthermore, it is possible to select which burners are or are not in operation and the fuel/air ratio can be adjusted. In addition, the BMS can communicate with other systems (such as a DCS) in a safe and reliable manner. And because we have extensive knowledge of the applicable standards, we also guarantee that the BMS will pass any certification procedure without problems.